Probing the chemical structure of monolayer covalent-organic frameworks grown via Schiff-base condensation reactions

Two-dimensional covalent-organic frameworks (2D-COFs) on surfaces offer a facile route to new 2D materials. Schiff-base condensation reactions have proven to be an effective fabrication route for such materials. We present scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS...

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2016, Vol.52 (64), p.9941-9944
Main Authors: Hu, Ya, Goodeal, Niall, Chen, Ying, Ganose, Alex M, Palgrave, Robert G, Bronstein, Hugo, Blunt, Matthew O
Format: Article
Language:English
Subjects:
Chemical reactions
Condensation
Covalence
Imines
Porphyrins
Scanning tunneling microscopy
X-ray photoelectron spectroscopy
X-rays
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Summary:Two-dimensional covalent-organic frameworks (2D-COFs) on surfaces offer a facile route to new 2D materials. Schiff-base condensation reactions have proven to be an effective fabrication route for such materials. We present scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) studies of porphyrin 2D-COFs grown at a solid-vapour interface. XPS shows that covalent links between porphyrins consist of a mixture of imines and hemiaminals, a non-conjugated intermediate in the Schiff-base condensation reaction. These results demonstrate that environmental conditions during growth can have an important impact on the chemical composition of Schiff-base 2D-COFs.
ISSN:1359-7345
1364-548X
DOI:10.1039/c6cc03895f